Observation of gamma rays from the northern celestial sky up to the sub-PeV range with the Tibet air shower array and its underground muon detector array
Year: 2023
Type: conference-paper
Abstract: Gamma-ray observation in the sub-PeV range helps us search for Galactic PeV cosmic-ray accelerators, PeVatrons. Measurement of the energy spectrum of gamma rays from astrophysical sources is especially crucial to discuss their hadronic or leptonic origin. In this study, gamma rays from the sky region of HESS J1843β033 are observed by the Tibet air shower array equipped with the underground muon detector array. A new gamma-ray source TASG J1844β038 is detected above 25 TeV with a 6.2 π level in the region of interest, the position of which is consistent with HESS J1843β033, eHWC J1842β035, and LHAASO J1843β0338. The gamma-ray energy spectrum of TASG J1844β038 is successfully measured in 25β130 TeV for the first time; it smoothly connects to that of HESS J1843β033 and gives consistent flux levels with those of eHWC J1842β035 and LHAASO J1843β0338 at 56 and 100 TeV, respectively. The analysis of the combined gamma-ray spectra between the H.E.S.S., LHAASO, and TASG sources indicates the cutoff at about 50 TeV. The distribution of the molecular clouds around TASG J1844β038 is investigated by analyzing public CO line-emission data; our study finds the clouds in the velocity range of 75β95 km s^β1 lying flat over the region with a 50 K km s^β1 level. The association of the observed gamma rays with a nearby supernova remnant SNR G28.6β0.1 is discussed, and it is proposed that cosmic rays accelerated by SNR G28.6β0.1 up to about 500 TeV generate the observed gamma rays from the collisions with the ambient gas found in the analysis.
DOI: 10.22323/1.444.0627
Authors: Sei Kato, M Amenomori, Y W Bao, X J Bi, D Chen, T L Chen, W Y Chen, Xu Chen, Y Chen, C Cirennima, S W Cui, Danzengluobu, L Ding, J H Fang, K Fang, C F Feng, Zhaoyang Feng, Z Y Feng, Qi GAO, Q B Gou, Y Q Guo, Y Hayashi, H H He, Z T He, K Hibino, N Hotta, Haibing Hu, H B Hu, K Y Hu, J Huang, H Y Jia, L Jiang, P Jiang, H B Jin, K Kasahara, Y Katayose, C Kato, I Kawahara, T Kawashima, K Kawata, M Kozai, L Labaciren, G M Le, A F Li, H J Li, W J Li, Y Li, Y H Lin, B Liu, C Liu, J S Liu, L Y Liu, M Y Liu, W Liu, H Lu, T Makishima, Y Masuda, S Matsuhashi, M Matsumoto, X R Meng, Y Meng, A Mizuno, K Munakata, Y Nakamura, H Nanjo, C C Ning, M Nishizawa, R Noguchi, M Ohnishi, S Okukawa, S Ozawa, X Qian, X B Qu, T Saito, M Sakata, T Sako, T Sasaki, J Shao, T Shibasaki, M Shibata, A Shiomi, H Sugimoto, W Takano, M Takita, Y H Tan, N Tateyama, S Torii, H Tsuchiya, S Udo, R Usui, H Wang, S F Wang, Y P Wang, W Wangdui, H R Wu, Q Wu, J L Xu, L Xue, Z Yang, Y Q Yao, J Yin, Y Yokoe, Y L Yu, A F Yuan, L M Zhai, H M Zhang, J L Zhang, X Zhang, Y Zhang, Yi Zhang, Ying Zhang, S P Zhao, Z Zhaxisangzhu, X X Zhou, Y H Zou
Institutions: Institute for Cosmic Ray Research, The University of Tokyo
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Funders: Ministry of Education, Culture, Sports, Science and Technology, National Natural Science Foundation of China, Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, National Astronomical Observatory of Japan, Japan Society for the Promotion of Science, National Institutes of Natural Sciences, Institute of High Energy Physics, Institute for Cosmic Ray Research, University of Tokyo, High Energy Physics
OpenAlex ID: W4385359282